Theory of spin, electronic and transport properties of the lateral triple quantum dot molecule in a magnetic field
| Autor: | Delgado, F., Shim, Y. -P., Korkusinski, M., Hawrylak, P. |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 76, 115332 (2007) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.76.115332 |
| Popis: | We present a theory of spin, electronic and transport properties of a few-electron lateral triangular triple quantum dot molecule in a magnetic field. Our theory is based on a generalization of a Hubbard model and the Linear Combination of Harmonic Orbitals combined with Configuration Interaction method (LCHO-CI) for arbitrary magnetic fields. The few-particle spectra obtained as a function of the magnetic field exhibit Aharonov-Bohm oscillations. As a result, by changing the magnetic field it is possible to engineer the degeneracies of single-particle levels, and thus control the total spin of the many-electron system. For the triple dot with two and four electrons we find oscillations of total spin due to the singlet-triplet transitions occurring periodically in the magnetic field. In the three-electron system we find a transition from a magnetically frustrated to the spin-polarized state. We discuss the impact of these phase transitions on the addition spectrum and the spin blockade of the lateral triple quantum dot molecule. Comment: 30 pages (one column), 9 figures |
| Databáze: | arXiv |
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